US7248309B2 - Liquid crystal display device and method for fabricating the same - Google Patents

Liquid crystal display device and method for fabricating the same Download PDF

Info

Publication number
US7248309B2
US7248309B2 US09/891,534 US89153401A US7248309B2 US 7248309 B2 US7248309 B2 US 7248309B2 US 89153401 A US89153401 A US 89153401A US 7248309 B2 US7248309 B2 US 7248309B2
Authority
US
United States
Prior art keywords
substrate
light emitting
lcd
layer
organic light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime, expires
Application number
US09/891,534
Other versions
US20020085143A1 (en
Inventor
Jeong Hyun Kim
Hyun Sik Seo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Display Co Ltd
Original Assignee
LG Philips LCD Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Philips LCD Co Ltd filed Critical LG Philips LCD Co Ltd
Assigned to LG.PHILIPS LCD CO., LTD. reassignment LG.PHILIPS LCD CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, JEONG HYUN, SEO, HYUN SIK
Publication of US20020085143A1 publication Critical patent/US20020085143A1/en
Priority to US11/826,003 priority Critical patent/US7576812B2/en
Application granted granted Critical
Publication of US7248309B2 publication Critical patent/US7248309B2/en
Assigned to LG DISPLAY CO., LTD. reassignment LG DISPLAY CO., LTD. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: LG.PHILIPS LCD CO., LTD.
Adjusted expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs

Definitions

  • the present invention relates to a display device, and in particular, to a liquid crystal display (LCD) device.
  • LCD liquid crystal display
  • An LCD is not a self-emissive light element but instead is a light receiving element necessitating an independent light source, and has a technical limitation in terms of brightness, contrast, angle of visual field, magnification of the view, etc. Therefore, efforts have been actively made to develop a novel flat display device.
  • An example is research into an organic electroluminescent (EL) device that has merits such as operability with low voltage, self-emission of light, a compact and slim appearance, wide angle of visual field and a quick response.
  • EL organic electroluminescent
  • the EL of an organic material was first discovered in single crystal Anthracene. Nevertheless, the first discovery failed to develop the EL device for more than the next 20 years due to its size limit and difficulty in growing the single crystal, as well as to an extremely high voltage ( ⁇ 1000V) required for its operation. Recently, however, a device has been developed having a film thickness of only 1000 ⁇ and operable with a low voltage of about 10V.
  • An organic light emitting diode comprises a cathode layer, an organic film layer, and an anode layer.
  • the organic film layer comprises an electron transport layer, a hole transport layer, and an organic emitting layer. If necessary, an electron injection layer and a hole injection layer may be additionally comprised of the organic film layer.
  • An inorganic EL device is similar to a compound in its concept that a fluorescent material is emitted by electric energy. However, a slight difference lies in terms of the excitation, which is a core of the emitting mechanism.
  • the inorganic EL device light emission is caused by energy generated by an acceleration and collision of electrons due to high voltage.
  • the organic EL device however, light emission is caused by rebinding of the holes injected from an anode and a cathode with electrons.
  • FIG. 1 is a sectional view of a conventional LCD illustrating a structure thereof.
  • the conventional LCD comprises two insulating substrates 101 , 101 a facing each other and having liquid crystal sealed therebetween, color filter layers 102 of red, green and blue formed on the upper substrate 101 for expressing colors, and black matrices 103 for shielding penetration of light into the parts other than the pixel electrodes formed on the lower substrate 101 a.
  • a common electrode 105 is formed to cover the color filter layers 102 and the black matrices. It is possible to form an overcoat 104 before forming the common electrode 105 .
  • Thin film transistors consisting of a gate electrode 106 elongated from a gate line, a source electrode 107 and a drain electrode 108 elongated from a data line, which is arrayed to cross the gate line, are formed on the lower substrate 101 a at regular intervals.
  • a pixel electrode is connected to the drain electrode 108 through a contact hole.
  • a backlight 112 is provided on an outer surface of the lower substrate 101 a.
  • Spacers 109 are dispersed between the color filter layers and thin film transistors to maintain a cell gap.
  • An LCD is not a self-emissive light element but a light receiving element necessitating an independent light source, thereby requiring a backlight.
  • the electric power consumed by the backlight occupies a dominant part of the electric power supplied to the LCD. Further, the backlight becomes a bar to reducing weight, thickness, length and size of the LCD.
  • an object of the present invention to provide an LCD and a method for fabricating the same that can overcome the easy breakability of the conventional LCD by employing an organic light emitting diode as a backlight of the LCD to reduce the thickness thereof, and by using an organic material like polymer.
  • an LCD comprising: a first substrate and a second substrate; a light emitting layer formed on an outer surface of the first substrate; a thin film transistor and a pixel electrode formed on the first substrate; a common electrode formed on the second substrate; and a liquid crystal layer formed between the first substrate and the second substrate.
  • a method for fabricating an LCD comprising the steps of: preparing a first substrate and a second substrate; forming a light emitting layer on an outer surface of the first substrate; forming a thin film transistor and a pixel electrode formed on the first substrate; and a liquid crystal layer between the first substrate and the second substrate.
  • the light emitting layer comprises a first insulating layer, an organic light element, and a second insulating layer.
  • the organic light element comprises a first electrode, a hole transport layer, an organic light emitting layer, electron transport layer, and a second electrode.
  • the advantageous effects of the present invention include overcoming the easy breakability of the conventional LCD by employing an organic light emitting diode as a backlight of the LCD to reduce the thickness thereof, and by using an organic light element as a substitute for a backlight, thereby reducing weight, thickness, length and size of the LCD and enhancing efficiency of electric power.
  • FIG. 1 is a sectional view of a conventional LCD illustrating a structure thereof
  • FIG. 2 is a sectional view of an LCD according to a preferred embodiment of the present invention illustrating a structure thereof;
  • FIGS. 3A to 3D are views of an LCD according to a preferred embodiment of the present invention illustrating a method for fabricating the same.
  • FIG. 2 is a sectional view of an LCD according to a preferred embodiment illustrating a structure thereof.
  • the LCD comprises two insulating substrates 201 a , 201 b facing each other having liquid crystal 211 sealed therebetween.
  • a first insulating layer 202 is formed on an outer surface of the insulating substrate 201 a .
  • An anode 203 of indium tin oxide (ITO) material is formed on the first insulating layer 202 .
  • An organic film layer 204 is formed on the anode 203 .
  • the organic film layer 204 comprises a hole transport layer( 204 a ), an organic light emitting layer( 204 b ), and an electron transport layer( 204 c ).
  • a cathode 205 of Mg or Li material is formed on the organic film layer.
  • a second insulating layer 206 is formed on the cathode 205 , and a protective layer 207 is formed on the second insulating layer 206 .
  • the first substrate 201 a is of polymer such as polycarbonate (PC), polyimide, polyethersulphone (PES), polyacrylate (PAR), polyethylenenaphthelate (PEN), or polyethyleneterephehalate (PET) having flexibility that can avoid easy breakability of the conventional glass substrate.
  • the first substrate 201 a and the second substrate 201 b perform an additional function of polarization deriving from the molecular array of a macromolecular organic material.
  • Sheet glass of a predetermined thickness is formed on an outer surface of the first substrate 201 a before the first insulating layer 202 is formed so as to shape the polymer substrate.
  • a thin film transistor 208 comprising a gate electrode, a gate insulating film, a semiconductor layer, a source electrode, and a drain electrode is formed on an upper portion of the first substrate 201 a by undergoing a series of processes.
  • a passivation layer 209 is laminated over the entire surface including the thin film transistor 208 .
  • Pixel electrodes 210 are formed on the passivation layer 209 at predetermined intervals.
  • a common electrode 212 is formed on the second substrate 201 b .
  • Color filter( 213 ) layers as well as black matrices( 214 ) may be additionally comprised to express colors and to shield penetration of light into the thin film transistor 208 of the first substrate 201 a , respectively.
  • FIGS. 3A to 3D are views of an LCD according to the preferred embodiment illustrating a method for fabricating the same.
  • the first insulating layer 202 preferably composed of SiO 2 or SiNx, is formed on an outer surface of the first substrate 201 a.
  • an ITO film is deposited on the first insulating layer 202 by means of sputtering to form the anode 203 .
  • the organic film layer 204 is formed on the anode 203 by forming a hole transport layer( 204 a ), an organic light emitting layer( 204 b ) and an electron transport layer( 204 c ) successively by means of vacuum deposition or spin coating of an organic material such as Alq3 (tris-8-hydroxyquinolinato aluminum), BeBq (bis-benzo-quinolinato-berellium), PPV (polyphenylenevinylene) or polyalkylthiphene.
  • the organic material should satisfy the following characteristics: a high fluorescent quantum yield under solid state; a high mobility of electrons and holes; and uneasy decomposability during vacuum deposition; an evenly formed film; and a film with a stable structure.
  • the cathode 205 is formed on the organic film layer 204 by depositing a conductive material, preferably a metallic material such as Mg, Li or a compound of Mg and Li, by means of sputtering.
  • a conductive material preferably a metallic material such as Mg, Li or a compound of Mg and Li
  • the second insulating layer 206 is formed on the cathode 205 , and the protective layer 207 is subsequently formed thereon to prevent deterioration of the cathode 205 caused by moisture and oxygen.
  • the protective layer is preferably composed of SiO x or IO x .
  • the thin film transistor (TFT) 208 comprising a gate electrode, a gate insulating film, a semiconductor layer, a source electrode, and a drain electrode is formed on the first substrate by undergoing a series of processes.
  • the passivation layer 209 is laminated over the entire surface including the thin film transistor 208 . Thereafter, pixel electrodes 210 are formed on the passivation layer 209 at predetermined intervals.
  • the fabrication of the LCD is completed by disposing the first substrate 201 a , on which the organic light emitting diode has been formed, and the second substrate 201 b as well as by injecting liquid crystal therebetween.
  • the method for fabricating the LCD according to the preferred embodiment may comprise the steps of forming an active region on the first substrate, and forming the organic light emitting diode on an outer surface of the first substrate.
  • the method may further comprise the steps of disposing the first substrate and the second substrate, and forming the organic light emitting diode.
  • an LCD and a method for fabricating the same as disclosed herein have the following advantageous effects.
  • the LCD as disclosed herein is much slimmer than the conventional LCD owing to an employment of an organic light emitting diode as a backlight. Also, the LCD as disclosed herein is not liable to be broken owing to an employment of an organic material for the substrates. Further, the polarizing function in the substrates of the LCD as disclosed herein does not necessitate any polarized plate, thereby serving to simplify the fabricating process.

Abstract

A liquid crystal display (LCD) device includes a first substrate and a second substrate, an organic light emitting element formed by interposing a first insulating layer on an outer surface of the first substrate, a second insulating layer and a protective layer formed in order over an entire surface of the organic light emitting element, a thin film transistor formed on the first substrate, a passivation layer formed over an entire surface of the first substrate including the thin film transistor, a pixel electrode formed on the passivation layer to be connected to the thin film transistor, a common electrode formed on the second substrate, and a liquid crystal layer formed between the first substrate and the second substrate. A method for fabricating the LCD includes the steps of forming a first insulating layer on an outer surface of a first substrate, forming an organic light emitting element on the first insulating layer, forming a second insulating layer over an entire surface of the organic light emitting element, forming a protective layer on the second insulating layer, forming a thin film transistor on the first substrate, forming a passivation layer over an entire surface of the first substrate including the thin film transistor, forming a pixel electrode on the passivation layer, and forming a liquid crystal layer between the first substrate and a second substrate.

Description

CROSS REFERENCES TO RELATED APPLICATIONS
This application claims the benefit of Korean Patent Application No. 2000-86010 filed on Dec. 29, 2000, the entirety of which is hereby incorporated by reference for all purposes as if filly set forth herein.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a display device, and in particular, to a liquid crystal display (LCD) device.
2. Description of the Related Art
An LCD is not a self-emissive light element but instead is a light receiving element necessitating an independent light source, and has a technical limitation in terms of brightness, contrast, angle of visual field, magnification of the view, etc. Therefore, efforts have been actively made to develop a novel flat display device. An example is research into an organic electroluminescent (EL) device that has merits such as operability with low voltage, self-emission of light, a compact and slim appearance, wide angle of visual field and a quick response.
The EL of an organic material was first discovered in single crystal Anthracene. Nevertheless, the first discovery failed to develop the EL device for more than the next 20 years due to its size limit and difficulty in growing the single crystal, as well as to an extremely high voltage (˜1000V) required for its operation. Recently, however, a device has been developed having a film thickness of only 1000 Å and operable with a low voltage of about 10V.
An organic light emitting diode (OLED) comprises a cathode layer, an organic film layer, and an anode layer. The organic film layer comprises an electron transport layer, a hole transport layer, and an organic emitting layer. If necessary, an electron injection layer and a hole injection layer may be additionally comprised of the organic film layer.
An inorganic EL device is similar to a compound in its concept that a fluorescent material is emitted by electric energy. However, a slight difference lies in terms of the excitation, which is a core of the emitting mechanism. In the inorganic EL device, light emission is caused by energy generated by an acceleration and collision of electrons due to high voltage. In the organic EL device, however, light emission is caused by rebinding of the holes injected from an anode and a cathode with electrons.
The following is a detailed description of a conventional LCD made with reference to FIG. 1.
FIG. 1 is a sectional view of a conventional LCD illustrating a structure thereof.
Referring to FIG. 1, the conventional LCD comprises two insulating substrates 101, 101 a facing each other and having liquid crystal sealed therebetween, color filter layers 102 of red, green and blue formed on the upper substrate 101 for expressing colors, and black matrices 103 for shielding penetration of light into the parts other than the pixel electrodes formed on the lower substrate 101 a.
A common electrode 105 is formed to cover the color filter layers 102 and the black matrices. It is possible to form an overcoat 104 before forming the common electrode 105.
Thin film transistors consisting of a gate electrode 106 elongated from a gate line, a source electrode 107 and a drain electrode 108 elongated from a data line, which is arrayed to cross the gate line, are formed on the lower substrate 101 a at regular intervals. A pixel electrode is connected to the drain electrode 108 through a contact hole. A backlight 112 is provided on an outer surface of the lower substrate 101 a.
Spacers 109 are dispersed between the color filter layers and thin film transistors to maintain a cell gap.
However, the conventional LCD and its fabrication method pose the following problems.
An LCD is not a self-emissive light element but a light receiving element necessitating an independent light source, thereby requiring a backlight. The electric power consumed by the backlight occupies a dominant part of the electric power supplied to the LCD. Further, the backlight becomes a bar to reducing weight, thickness, length and size of the LCD.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide an LCD and a method for fabricating the same that can overcome the easy breakability of the conventional LCD by employing an organic light emitting diode as a backlight of the LCD to reduce the thickness thereof, and by using an organic material like polymer.
To achieve the above object, there is provided an LCD comprising: a first substrate and a second substrate; a light emitting layer formed on an outer surface of the first substrate; a thin film transistor and a pixel electrode formed on the first substrate; a common electrode formed on the second substrate; and a liquid crystal layer formed between the first substrate and the second substrate.
There is also provided a method for fabricating an LCD, comprising the steps of: preparing a first substrate and a second substrate; forming a light emitting layer on an outer surface of the first substrate; forming a thin film transistor and a pixel electrode formed on the first substrate; and a liquid crystal layer between the first substrate and the second substrate.
The light emitting layer comprises a first insulating layer, an organic light element, and a second insulating layer. The organic light element comprises a first electrode, a hole transport layer, an organic light emitting layer, electron transport layer, and a second electrode.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The advantageous effects of the present invention include overcoming the easy breakability of the conventional LCD by employing an organic light emitting diode as a backlight of the LCD to reduce the thickness thereof, and by using an organic light element as a substitute for a backlight, thereby reducing weight, thickness, length and size of the LCD and enhancing efficiency of electric power.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a sectional view of a conventional LCD illustrating a structure thereof,
FIG. 2 is a sectional view of an LCD according to a preferred embodiment of the present invention illustrating a structure thereof; and
FIGS. 3A to 3D are views of an LCD according to a preferred embodiment of the present invention illustrating a method for fabricating the same.
 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
A preferred embodiment of the present invention will be described herein below with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
FIG. 2 is a sectional view of an LCD according to a preferred embodiment illustrating a structure thereof.
Referring to FIG. 2, the LCD comprises two insulating substrates 201 a, 201 b facing each other having liquid crystal 211 sealed therebetween. A first insulating layer 202 is formed on an outer surface of the insulating substrate 201 a. An anode 203 of indium tin oxide (ITO) material is formed on the first insulating layer 202. An organic film layer 204 is formed on the anode 203. The organic film layer 204 comprises a hole transport layer(204 a), an organic light emitting layer(204 b), and an electron transport layer(204 c). A cathode 205 of Mg or Li material is formed on the organic film layer. A second insulating layer 206 is formed on the cathode 205, and a protective layer 207 is formed on the second insulating layer 206.
Here, the first substrate 201 a is of polymer such as polycarbonate (PC), polyimide, polyethersulphone (PES), polyacrylate (PAR), polyethylenenaphthelate (PEN), or polyethyleneterephehalate (PET) having flexibility that can avoid easy breakability of the conventional glass substrate. The first substrate 201 a and the second substrate 201 b perform an additional function of polarization deriving from the molecular array of a macromolecular organic material.
Sheet glass of a predetermined thickness is formed on an outer surface of the first substrate 201 a before the first insulating layer 202 is formed so as to shape the polymer substrate.
Meanwhile, a thin film transistor 208 comprising a gate electrode, a gate insulating film, a semiconductor layer, a source electrode, and a drain electrode is formed on an upper portion of the first substrate 201 a by undergoing a series of processes. A passivation layer 209 is laminated over the entire surface including the thin film transistor 208. Pixel electrodes 210 are formed on the passivation layer 209 at predetermined intervals.
A common electrode 212 is formed on the second substrate 201 b. Color filter(213) layers as well as black matrices(214) may be additionally comprised to express colors and to shield penetration of light into the thin film transistor 208 of the first substrate 201 a, respectively.
FIGS. 3A to 3D are views of an LCD according to the preferred embodiment illustrating a method for fabricating the same.
As shown in FIG. 3A, the first insulating layer 202, preferably composed of SiO2 or SiNx, is formed on an outer surface of the first substrate 201 a.
As shown in FIG. 3B, an ITO film is deposited on the first insulating layer 202 by means of sputtering to form the anode 203. Thereafter, the organic film layer 204 is formed on the anode 203 by forming a hole transport layer(204 a), an organic light emitting layer(204 b) and an electron transport layer(204 c) successively by means of vacuum deposition or spin coating of an organic material such as Alq3 (tris-8-hydroxyquinolinato aluminum), BeBq (bis-benzo-quinolinato-berellium), PPV (polyphenylenevinylene) or polyalkylthiphene. The organic material should satisfy the following characteristics: a high fluorescent quantum yield under solid state; a high mobility of electrons and holes; and uneasy decomposability during vacuum deposition; an evenly formed film; and a film with a stable structure.
The cathode 205 is formed on the organic film layer 204 by depositing a conductive material, preferably a metallic material such as Mg, Li or a compound of Mg and Li, by means of sputtering.
As shown in FIG. 3C, the second insulating layer 206 is formed on the cathode 205, and the protective layer 207 is subsequently formed thereon to prevent deterioration of the cathode 205 caused by moisture and oxygen. The protective layer is preferably composed of SiOx or IOx.
As shown in FIG. 3D, the thin film transistor (TFT) 208 comprising a gate electrode, a gate insulating film, a semiconductor layer, a source electrode, and a drain electrode is formed on the first substrate by undergoing a series of processes. The passivation layer 209 is laminated over the entire surface including the thin film transistor 208. Thereafter, pixel electrodes 210 are formed on the passivation layer 209 at predetermined intervals.
Though not shown in the drawing, the fabrication of the LCD is completed by disposing the first substrate 201 a, on which the organic light emitting diode has been formed, and the second substrate 201 b as well as by injecting liquid crystal therebetween.
Meanwhile, the method for fabricating the LCD according to the preferred embodiment may comprise the steps of forming an active region on the first substrate, and forming the organic light emitting diode on an outer surface of the first substrate. The method may further comprise the steps of disposing the first substrate and the second substrate, and forming the organic light emitting diode.
As described above, an LCD and a method for fabricating the same as disclosed herein have the following advantageous effects.
The LCD as disclosed herein is much slimmer than the conventional LCD owing to an employment of an organic light emitting diode as a backlight. Also, the LCD as disclosed herein is not liable to be broken owing to an employment of an organic material for the substrates. Further, the polarizing function in the substrates of the LCD as disclosed herein does not necessitate any polarized plate, thereby serving to simplify the fabricating process.
While the invention has been shown and described with reference to a certain preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. A liquid crystal display (LCD) device comprising:
a first substrate and a second substrate;
an inorganic insulating layer made of one of silicon oxide and silicon nitride on a first side of the first substrate;
a light emitting structure including an organic light emitting layer on the inorganic insulating layer;
a protective layer on the light emitting structure to protect the light emitting structure;
a thin film transistor (TFT) array structure including thin film transistors and pixel electrodes on a second side of the first substrate, wherein the first side is opposite to the second side;
a common electrode on a surface of the second substrate; and
a liquid crystal layer between the first substrate and the second substrate, whereby the light emitting structure shares the first substrate with the TFT array structure.
2. The LCD of claim 1, wherein the light emitting structure is a light emitting diode.
3. The LCD of claim 1, wherein the light emitting structure comprises:
a first electrode disposed on the inorganic insulating layer;
the organic light emitting layer on the first electrode; and
a second electrode on the organic light emitting layer.
4. The LCD of claim 3, wherein the organic light emitting layer comprises:
a hole transport layer;
an organic light emitting layer; and
an electron transport layer.
5. The LCD of claim 1, wherein the organic light emitting layer comprises any one of Alq3 (tris-8-hydroxyquinolinato aluminum), BeBq (bis-benzo-quinolinato-berellium), PPV (polyphenylenevinylene) or polyalkylthiphene.
6. The LCD of claim 3, wherein the first electrode is indium tin oxide.
7. The LCD of claim 1, wherein the first substrate is composed of an organic material.
8. The LCD of claim 7, wherein the first substrate performs an additional function of polarization.
9. The LCD of claim 1, wherein the protective layer includes SiOx or IOx.
US09/891,534 2000-12-29 2001-06-27 Liquid crystal display device and method for fabricating the same Expired - Lifetime US7248309B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/826,003 US7576812B2 (en) 2000-12-29 2007-07-11 Liquid crystal display device and method for fabricating the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020000086010A KR100853769B1 (en) 2000-12-29 2000-12-29 Liquid crystal display and manufacturing method of the same
KRP2000-86010 2000-12-29

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/826,003 Division US7576812B2 (en) 2000-12-29 2007-07-11 Liquid crystal display device and method for fabricating the same

Publications (2)

Publication Number Publication Date
US20020085143A1 US20020085143A1 (en) 2002-07-04
US7248309B2 true US7248309B2 (en) 2007-07-24

Family

ID=19703973

Family Applications (2)

Application Number Title Priority Date Filing Date
US09/891,534 Expired - Lifetime US7248309B2 (en) 2000-12-29 2001-06-27 Liquid crystal display device and method for fabricating the same
US11/826,003 Expired - Lifetime US7576812B2 (en) 2000-12-29 2007-07-11 Liquid crystal display device and method for fabricating the same

Family Applications After (1)

Application Number Title Priority Date Filing Date
US11/826,003 Expired - Lifetime US7576812B2 (en) 2000-12-29 2007-07-11 Liquid crystal display device and method for fabricating the same

Country Status (2)

Country Link
US (2) US7248309B2 (en)
KR (1) KR100853769B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050242745A1 (en) * 2004-04-30 2005-11-03 Samsung Electronics Co., Ltd. Organic light emitting diode display device and fabricating method thereof
US20060187213A1 (en) * 2005-02-21 2006-08-24 Au Optronics Corp. Electroluminescence display with touch panel
US20110201141A1 (en) * 2003-01-15 2011-08-18 Semiconductor Energy Laboratory Co., Ltd. Liquid crystal display device and manufacturing method of liquid crystal display device
US20140354893A1 (en) * 2013-05-30 2014-12-04 VIZIO Inc. Transparent FIPEL backlight panels which display colored light from a front surface to a light modulator and a white light from a back surface

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7045861B2 (en) * 2002-03-26 2006-05-16 Semiconductor Energy Laboratory Co., Ltd. Light-emitting device, liquid-crystal display device and method for manufacturing same
SG130013A1 (en) * 2002-07-25 2007-03-20 Semiconductor Energy Lab Method of fabricating light emitting device
TW583466B (en) * 2002-12-09 2004-04-11 Hannstar Display Corp Structure of liquid crystal display
US6900458B2 (en) * 2003-02-21 2005-05-31 Universal Display Corporation Transflective display having an OLED backlight
US20050007517A1 (en) * 2003-07-08 2005-01-13 Organic Lighting Technologies Llc Organic light emitting diode backlight integrated LCD
JP4845336B2 (en) * 2003-07-16 2011-12-28 株式会社半導体エネルギー研究所 Display device with imaging function and bidirectional communication system
US7292614B2 (en) * 2003-09-23 2007-11-06 Eastman Kodak Company Organic laser and liquid crystal display
KR100696282B1 (en) * 2005-02-17 2007-03-19 주식회사 대우일렉트로닉스 Liquid crystal display comprising organic electro luminescent backlight
US7272275B2 (en) * 2005-03-31 2007-09-18 Eastman Kodak Company Polarized light emitting source with an electro-optical addressing architecture
US20060291769A1 (en) * 2005-05-27 2006-12-28 Eastman Kodak Company Light emitting source incorporating vertical cavity lasers and other MEMS devices within an electro-optical addressing architecture
EP1845514B1 (en) * 2006-04-14 2013-10-02 Semiconductor Energy Laboratory Co., Ltd. Display device and method for driving the same
US8054415B2 (en) * 2009-08-24 2011-11-08 Lsi Corporation LED LCD backlight with lens structure
US8476622B2 (en) * 2011-01-05 2013-07-02 Electronics And Telecommunications Research Institute Active matrix organic light emitting diode
WO2013008765A1 (en) * 2011-07-08 2013-01-17 Semiconductor Energy Laboratory Co., Ltd. Light-emitting module, light-emitting device, and method for manufacturing the light-emitting module
JP6061581B2 (en) 2012-09-19 2017-01-18 ソニーセミコンダクタソリューションズ株式会社 Display device
CN103323975B (en) * 2013-06-08 2015-09-23 北京京东方光电科技有限公司 A kind of array base palte, display panels and display device
KR101596585B1 (en) * 2014-07-18 2016-02-23 한양대학교 산학협력단 Liquid crystal display
KR102537329B1 (en) * 2015-11-27 2023-05-26 엘지디스플레이 주식회사 Light controlling device, and transparent display device including the same
CN107399421B (en) * 2016-05-19 2024-03-15 深圳光启空间技术有限公司 Skin, aerostat and manufacturing method of skin
JP6235657B2 (en) * 2016-07-08 2017-11-22 ソニーセミコンダクタソリューションズ株式会社 Display device
KR102574641B1 (en) 2016-07-19 2023-09-06 삼성디스플레이 주식회사 Display appartus

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4586791A (en) * 1982-04-07 1986-05-06 Hitachi, Ltd. Optical modulation element with surface parallel and unidirectional alignment of LC
US4674840A (en) * 1983-12-22 1987-06-23 Polaroid Corporation, Patent Dept. Liquid crystal display with polarizer and biaxial birefringent support
US4772885A (en) * 1984-11-22 1988-09-20 Ricoh Company, Ltd. Liquid crystal color display device
US5504599A (en) * 1992-11-26 1996-04-02 Sharp Kabushiki Kaisha Liquid crystal display device having an EL light source in a non-display region or a region besides a display picture element
US5763110A (en) * 1996-09-03 1998-06-09 Xerox Corporation Electroluminescent devices comprising polynuclear arylamines
US5852487A (en) * 1996-01-25 1998-12-22 Sharp Kabushiki Kaisha LCD device having an input function and polymer substrates having dual function
US6361885B1 (en) * 1998-04-10 2002-03-26 Organic Display Technology Organic electroluminescent materials and device made from such materials
US6403238B1 (en) * 1998-07-10 2002-06-11 Hoerhold Hans-Heinrich Organic light-emitting diodes (OLED) including poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene-1,2-ethenylene-2,5-dimethoxy-1,4-phenylene-1,2-ethenylene] as electroluminescent material
US6507379B1 (en) * 1996-05-10 2003-01-14 Seiko Epson Corporation Liquid crystal projection device having a liquid crystal display element that includes an electroluminescent element

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1078582A (en) * 1996-09-04 1998-03-24 Casio Comput Co Ltd Display device and its driving method
JPH10253959A (en) * 1997-03-10 1998-09-25 Casio Comput Co Ltd Liquid crystal display device
KR100583559B1 (en) * 1998-10-20 2006-10-24 삼성전자주식회사 Electroluminescent type back light source device and liquid crystal display module using the same
KR100382066B1 (en) * 2000-02-02 2003-04-26 삼성에스디아이 주식회사 Method of attaching electro luminescence to liquid crystal device
KR100623224B1 (en) * 2000-11-27 2006-09-11 삼성에스디아이 주식회사 Liquid crystal display of back light and manufacturing method there of

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4586791A (en) * 1982-04-07 1986-05-06 Hitachi, Ltd. Optical modulation element with surface parallel and unidirectional alignment of LC
US4674840A (en) * 1983-12-22 1987-06-23 Polaroid Corporation, Patent Dept. Liquid crystal display with polarizer and biaxial birefringent support
US4772885A (en) * 1984-11-22 1988-09-20 Ricoh Company, Ltd. Liquid crystal color display device
US5504599A (en) * 1992-11-26 1996-04-02 Sharp Kabushiki Kaisha Liquid crystal display device having an EL light source in a non-display region or a region besides a display picture element
US5852487A (en) * 1996-01-25 1998-12-22 Sharp Kabushiki Kaisha LCD device having an input function and polymer substrates having dual function
US6507379B1 (en) * 1996-05-10 2003-01-14 Seiko Epson Corporation Liquid crystal projection device having a liquid crystal display element that includes an electroluminescent element
US5763110A (en) * 1996-09-03 1998-06-09 Xerox Corporation Electroluminescent devices comprising polynuclear arylamines
US6361885B1 (en) * 1998-04-10 2002-03-26 Organic Display Technology Organic electroluminescent materials and device made from such materials
US6403238B1 (en) * 1998-07-10 2002-06-11 Hoerhold Hans-Heinrich Organic light-emitting diodes (OLED) including poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene-1,2-ethenylene-2,5-dimethoxy-1,4-phenylene-1,2-ethenylene] as electroluminescent material

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110201141A1 (en) * 2003-01-15 2011-08-18 Semiconductor Energy Laboratory Co., Ltd. Liquid crystal display device and manufacturing method of liquid crystal display device
US8218105B2 (en) 2003-01-15 2012-07-10 Semiconductor Energy Laboratory Co., Ltd. Liquid crystal display device and manufacturing method of liquid crystal display device
US8634041B2 (en) 2003-01-15 2014-01-21 Semiconductor Energy Laboratory Co., Ltd. Liquid crystal display device and manufacturing method of liquid crystal display device
US20050242745A1 (en) * 2004-04-30 2005-11-03 Samsung Electronics Co., Ltd. Organic light emitting diode display device and fabricating method thereof
US7705817B2 (en) * 2004-04-30 2010-04-27 Samsung Electronics Co., Ltd. Organic light emitting diode display device and fabricating method thereof
US20060187213A1 (en) * 2005-02-21 2006-08-24 Au Optronics Corp. Electroluminescence display with touch panel
US20140354893A1 (en) * 2013-05-30 2014-12-04 VIZIO Inc. Transparent FIPEL backlight panels which display colored light from a front surface to a light modulator and a white light from a back surface
US9407856B2 (en) * 2013-05-30 2016-08-02 Vizio, Inc. Transparent FIPEL backlight panels which display colored light from a front surface to a light modulator and a white light from a back surface

Also Published As

Publication number Publication date
US7576812B2 (en) 2009-08-18
KR20020056619A (en) 2002-07-10
US20020085143A1 (en) 2002-07-04
KR100853769B1 (en) 2008-08-25
US20080018829A1 (en) 2008-01-24

Similar Documents

Publication Publication Date Title
US7576812B2 (en) Liquid crystal display device and method for fabricating the same
US7518147B2 (en) Organic electro luminescence device and fabrication method thereof
US9595691B2 (en) Organic light emitting diode device
KR100573149B1 (en) Electrolumimescence display device and method for manufacturing the same
US9224978B2 (en) Organic light emitting diode display device
CN100521842C (en) Active matrix organic electroluminescent display device and method of manufacturing the display device
US8455893B2 (en) Light-emitting apparatus and production method thereof
TWI582980B (en) Organic light-emitting display apparatus and method of manufacturing the same
US7326966B2 (en) Electroluminescence display device and method of manufacturing the same
US7718476B2 (en) Display apparatus and fabricating method thereof
US7494396B2 (en) Organic electroluminescent device including transparent conductive layer and fabricating method thereof
US10790476B2 (en) OLED display substrate and method for preparing the same, and display device
KR20030054707A (en) Organic electro luminescence display device
KR20050090586A (en) Electroluminescence display device
US7592635B2 (en) Organic electroluminescent device
US9019255B2 (en) Polarizer film, and organic light emitting display apparatus providing the same
US20060214564A1 (en) Organic electroluminescent display and method for fabricating the same
JPH09245964A (en) Manufacture of optical element
KR20150021212A (en) Method for fabricating Organic Electroluminescence Device and the Organic Electroluminescence Device fabricated by the method
US10644086B2 (en) Electroluminescent display device
KR20100013533A (en) Light emitting diode display device and method for driving the same
KR20050079110A (en) Organic electro luminescence device and fabricating method thereof

Legal Events

Date Code Title Description
AS Assignment

Owner name: LG.PHILIPS LCD CO., LTD., KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KIM, JEONG HYUN;SEO, HYUN SIK;REEL/FRAME:012298/0555

Effective date: 20011015

STCF Information on status: patent grant

Free format text: PATENTED CASE

AS Assignment

Owner name: LG DISPLAY CO., LTD., KOREA, REPUBLIC OF

Free format text: CHANGE OF NAME;ASSIGNOR:LG.PHILIPS LCD CO., LTD.;REEL/FRAME:021754/0230

Effective date: 20080304

Owner name: LG DISPLAY CO., LTD.,KOREA, REPUBLIC OF

Free format text: CHANGE OF NAME;ASSIGNOR:LG.PHILIPS LCD CO., LTD.;REEL/FRAME:021754/0230

Effective date: 20080304

FEPP Fee payment procedure

Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1553); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 12